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0.05). Pain threshold was the least in silver carp (6±0.38 volts); however, it was the same for carps, grass carps, and bigheads (7.5±0.49 volts). Also, the death threshold was the same for carp fish and bigheads (18±1.21 volts), while the difference was significant (P<0.05) for grass carps and silver carp (15±1.01 volts). Besides, the pH and TVN of carp flesh were measured over a three-month period in ordinary slaughtering and also using electricity, no significant differences were observed in pH immediately after being slaughtered. While at the end of the second and third months, the difference was significant in some species (P<0.05). Measuring the TVN under the two mentioned conditions demonstrated no considerable changes in slaughtering by electricity until the end of the third month, while ordinary ways of killing showed significant changes (P<0.05). In the way, the bigheads having the minimum and the carps and silver carp had the maximum amount of TVN.]]>
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0.05). Results showed that morphmetric parameters such as weight, length and wing length and also sex have no significant effects on total Hg accumulation in this bird. Mercury levels in feather were below the threshold of 5–15mg kg–1 that may affect birds. Results also showed the low bioaccumulation of Hg in the Hara Wetland ecosystem is not so critical. Accordingly, we recommend that the western reef heron can use as a biomonitoring of mercury pollution in this region.]]>
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